OBD2 Fault Code Library

Free lookup for thousands of OBD2 trouble codes: filter by family, read short meanings, and open deeper articles. Desktop ELM327 scanner with live data and AI guidance.

OBD2 symptoms

Look up diagnostic trouble codes by what the car is doing: misfire, overheating, rough idle, a check engine light, and other common symptoms.

C1177 — C1177 — Park Brake Actuator Assembly Switch Released Circuit Failure. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector, failed wheel speed sensor.
C1178 — OBD2 code C1178 flags a problem with the sensor and actuator circuits (speed wheel sensor LR coherency fault). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, open or shorted wiring in the circuit, poor ground connection.
C1179 — C1179 — Speed Control Actuator Assembly Cable Slack Failure. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, poor ground connection, faulty sensor or actuator of the affected circuit.
C1180 — Park Brake Valve Solenoid #1 Sense Input Circuit Failure (C1180): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector, faulty ABS module or pump motor.
C1181 — Park Brake Valve Solenoid #1 Sense Input Circuit Short to Gound (C1181): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by blown fuse or low voltage to the ABS module, damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector.
C1182 — OBD2 code C1182 flags a problem with the sensor and actuator circuits (park lamp flash relay circuit failure). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
C1183 — C1183 — Park Lamp Flash Relay Circuit Short to Battery. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit, corroded, loose or damaged connector.
C1184 — ABS System Is Not Operational (C1184): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by faulty ABS module or pump motor, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.
C1185 — C1185 — ABS Power Relay Output Circuit Failure. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector.
C1186 — ABS Power Relay Output Open Circuit (C1186): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector.
C1187 — Brake Fluid Level Sensor Input Open Circuit (C1187): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module, failed wheel speed sensor.
C1188 — C1188 — Brake Fluid Level Sensor Input Short Circuit To Battery. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, failed wheel speed sensor, blown fuse or low voltage to the ABS module.
C1189 — C1189 — Brake Fluid Level Sensor Input Short Circuit To Ground. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: failed wheel speed sensor, damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector.
C1190 — Speed Wheel Sensor LF Input Short Circuit To Battery (C1190): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by control module driver fault, poor ground connection, blown fuse feeding the circuit.
C1191 — OBD2 code C1191 flags a problem with the sensor and actuator circuits (speed wheel sensor LF input short circuit to ground). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, control module driver fault.
C1192 — C1192 — Speed Wheel Sensor RF Input Short Circuit To Battery. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, control module driver fault, open or shorted wiring in the circuit.
C1193 — OBD2 code C1193 flags a problem with the sensor and actuator circuits (speed wheel sensor RF input short circuit to ground). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, blown fuse feeding the circuit.
C1194 — OBD2 code C1194 flags a problem with the ignition system (ABS outlet valve coil LF circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap, failed ignition coil or coil pack.
C1195 — ABS Outlet Valve Coil LF Circuit Open (C1195): a chassis (brakes/steering/suspension) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by worn spark plugs or wrong plug gap, failed ignition coil or coil pack, damaged coil wiring or connector.
C1196 — ABS Outlet Valve Coil LF Circuit Short To Battery (C1196): a chassis (brakes/steering/suspension) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by worn spark plugs or wrong plug gap, faulty ignition control circuit in the ECM, failed ignition coil or coil pack.
C1197 — OBD2 code C1197 flags a problem with the ignition system (ABS outlet valve coil LF circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: faulty ignition control circuit in the ECM, failed ignition coil or coil pack, damaged coil wiring or connector.
C1198 — C1198 — ABS Inlet Valve Coil LF Circuit Failure. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: failed ignition coil or coil pack, moisture or oil in the spark plug wells, faulty ignition control circuit in the ECM.
C1199 — ABS Inlet Valve Coil LF Circuit Open (C1199): a chassis (brakes/steering/suspension) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by faulty ignition control circuit in the ECM, failed ignition coil or coil pack, worn spark plugs or wrong plug gap.
C1200 — OBD2 code C1200 flags a problem with the ignition system (ABS inlet valve coil LF circuit short to battery). Short, gentle driving to a shop is usually possible. Common culprits: faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap.